(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

For our Work-Energy lab, we are supposed to prove that W = Eg = Ek but no matter what I do, my Eg doesnt not equal the Ek = W.

In this lab, we had a tray dangling via a string which is attached to a cart which is on a dynamic track made out of platinum. We let go of the cart (start the stop watch) and when the cart hits the metal beam (we stop the stop watch). We calculated the ∆h by measuring initial height - final height. What am I doing wrong in my calculations?

mass of cart: 0.25468g

∆t = 1.03

mass of tray = .0199kg

∆h = .488m

∆d = 0.5m

a = .94m/s^2

vf = 0.9682m/s

2. Relevant equations

Eg = mgh

Ek = .5mv^2

3. The attempt at a solution

Eg = .0199 x 9.8 x .488

Eg = 0.95J

Ek = 0.5 x .25468 x (0.9682)^2

Ek = 0.119J

W = a x m x ∆d

= .94 x .25468 x .5

= 0.119J

According to the Law of conservation of energy, Ek, Eg and W should equal each other or be very close to each other but no matter what, I can't get them to equal each other.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Eg does not equal W = Ek

**Physics Forums | Science Articles, Homework Help, Discussion**